TRAFFIC SIGNALS And Vehicle Detection Systems, either of vehicles. Pedestrians MUST push the example by monitoring the arterials during
pedestrian push button in order to cross events such as the Rose Bowl, TMC staff
D) Inductive loops or sensors either the major or minor streets. can make adjustments to the signal timing
Or to facilitate better ingress and egress.
A traffic signal is an electronic device that E) Video detection system
assigns right-of-way at an intersection or Another type of ITS device is a Changeable
street crossing by means of displaying the TRAFFIC MANAGEMENT Message Sign or CMS. They are
standard red, yellow, and green-colored TYPES OF TRAFFIC SIGNAL CENTER strategically located along major arterials
indications. In addition, it also works in OPERATIONS throughout the City. These signs display
The City of Pasadena’s Traffic
conjunction with pedestrian displays to useful information to alert motorists of road
Management Center (TMC) is a state-of-
assign pedestrian crossing right-of-way. In the City of Pasadena, traffic signals conditions ahead or Rose Bowl information
the art computerized traffic signal control
mainly operate in three modes: during event day.
system. The computer monitors the City’s
TRAFFIC SIGNAL traffic signals 24 - hours a day and city
COMPONENTS 2. Semi-Actuated
traffic engineers use this information to
make signal timing adjustments. All traffic
Most traffic signals will have the following signals are programmed with special
components or parts: timing plans to improve traffic flow
Fixed-time mode: Under this mode, citywide.
there are no detections for any approach.
The signal continuously cycles regardless Technological applications in traffic
of actual traffic demand. Pedestrian walk engineering are referred to as Intelligent
signals are automatic and will cycle Transportation Systems (ITS). ITS devices
concurrently with the vehicular signal include Closed Circuit Television (CCTV)
indication. cameras which are used to monitor traffic
flow along major arterial segments to
Semi-Actuated mode: Under this ensure that traffic synchronization is
mode, the detection system is present only working properly.
on a minor cross street. When detection is
activated, the green light on a major street
is interrupted to allow the minor street Quick Traffic Signal Facts:
traffic and pedestrians to safely enter the
• There are 300 signalized intersections
intersection. Pedestrian walk signals for
crossing a minor street are automatic, • There are 20 CCTV Traffic Surveillance
while those for crossing a major street are Cameras.
not. Pedestrians crossing a major street • There are 10 Changeable Message
A) Main display with red, yellow, and must push the “pedestrian push button” to Signs.
• Three (3) intersections are equipped
green lights. get the walk signal.
B) Pedestrian crossing lights containing with Red Light Camera system.
both the “WALK” and “DON’T WALK” Actuated mode: Under this mode, In addition, the CCTV cameras are
light indications. there are detections for all approaches. beneficial to handle traffic caused by non-
C) Traffic signal cabinet containing the The traffic signal is set to provide the green recurring events such as accidents,
traffic signal controller. light “on-demand” or only in the presence freeway closures and special events. For
collisions and the number of observed A. There may be excessive delays for
violations. One of those locations is at motorists and increased utilization of minor
TRAFFIC OPERATIONS AT THE Marengo Avenue at Union Street (see streets where new signals are installed.
PASADENA METRO GOLD LINE picture below). Also, motorists may sometimes cut
STATION AREAS through residential neighborhoods to avoid
a congested signalized location.
Q. Along Arroyo Parkway at Del Mar
and California Boulevards, there are new
signal displays that show a blinking yellow
arrow. What does this signal display
mean? TRAFFIC SIGNALS
A. A blinking or flashing yellow arrow
means that you may proceed to make a
left-turn with caution, if oncoming traffic
has cleared the intersection.
As a proponent of multimodal transportation A high-level security encrypted digital video Q. What should motorists do if a traffic
systems, the City of Pasadena is fortunate to camera system is installed at each signal is flashing red or is inoperable?
have the Pasadena Metro Gold Line service approach of the intersection and records
six stops in Pasadena (see above). those motorists that violate the red light A. The California Vehicle Code
indication. Violations are verified by the requires drivers to approach the
Most of the Gold Line in Pasadena is
Pasadena Police Department, and citations intersection as if it was stop-controlled.
traversing through its own dedicated right-of-
are sent by mail to the registered owner of Motorists must make a complete stop, look
way, completely separated from road traffic.
the vehicle. both ways and proceed through the
At the southerly portion of the line, there are
intersection when it is safe to do so.
three grade crossings along Del Mar F.A.Q.’S
Boulevard, California Boulevard, and We hope you have found this information
Glenarm Street. In this area, a dedicated useful. Please contact us if you have any
traffic control system minimizes delay to Q. How are traffic signals installed?
questions or comments.
motorists caused by Metro Gold Line
A series of studies a conducted
crossings. Special signal timing plans (with For more information contact us:
by Traffic Engineers and these results are
ongoing refinement) mitigate traffic delays as
measured against guidelines established City of Pasadena
commuter traffic interacts with each train Department of Transportation
by the State of California, Department of
arrival. Traffic Engineering Division
Transportation (Caltrans). These results
are used to s how that a traffic signal is 221 East Walnut Street, Suite 210
RED LIGHT ENFORCEMEN T warranted, and then it is placed as a future Pasadena, CA 91101
improvement in the City’s Capital 626.744.TRIP (8747)
Red Light Cameras are located at critical Or
Improvement Program (CIP).
intersections in the City. The locations are
visit our website at
based on safety needs of the intersection as Q. Are there disadvantages of
shown by a high number of broadside installing traffic signals? http://www.cityofpasadena.net/trans